Office chair



FIG. 1 is a front perspective view of the office chair showing my new invention;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

In the drawings, the broken lines represent portions of the office chair that form no part of the claimed design. 

CLAIM The ornamental design for an office chair, as shown and described. 